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Subject: Invalid cert for

Make sure that your domain is @"". So you user name should be "". Your client might need its connect server to "", but most modern clients shouldn't need that setting.

If you were previously logging in as "" for a long time and you have contact lists, etc. then you might want to keep using as your domain so you can keep your contacts and so people can reach you at the same address. In that case, you will likely have to manually accept that certificate. Note that your phone does say that it's valid for *, so that's the FSF's cert.

Please let me know if there are any further issues.